Sdxc uhs-i memory card - c10, u3, v30, 4k uhd, sd card - sdsdxxd-128g-gn4in
shot speeds up to 90mb/s (write speed up to 90mb/s. based on internal testing; performance may be lower depending upon host device. 1mb=1,000,000 bytes. x = 150kb/sec.)
perfect for shooting 4k uhd video and sequential burst mode photography (full hd (1920x1080) and 4k uhd (3840 x 2160) video support may vary based upon host device, file attributes and other factors. see hd page on sandisk site.) sequential write performance: up to 90mb/s
uhs speed class 3 (u3) and video speed class 30 (v30) (uhs speed class 3 designates a performance option designed to support 4k uhd video recording with enabled uhs host devices.